Blast executables are aviable for Mac, PC(Win32), Linus, and Unix systems.
To run Blast locally, you need to (1) install blast executable and (2) format
a blast database. Instructions of installing blast on a Unix system can
be found at
http://genome.nhgri.nih.gov/blastall/blast_install/. The following
instructions assume you are installing on a PC(Win32).